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[Emacs] Improve handling of eval defvars

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Ivan Malison 2016-11-02 18:23:03 -07:00
parent 537371d353
commit ed4f6aed58
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1 changed files with 8 additions and 17 deletions
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dotfiles/emacs.d/README.org
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@ -2413,25 +2413,16 @@ Taken from http://endlessparentheses.com/eval-result-overlays-in-emacs-lisp.html
(point)))))
#+END_SRC
**** Reevalute defvars when running eval-last-sexp
What follows is a function that checks to see if what precedes point is a defvar
and reevaluates it as a setq if it is
#+BEGIN_SRC emacs-lisp
(defun imalison:defvar-at-point ()
(let* ((preceding-sexp (elisp--preceding-sexp)))
(when (and (listp preceding-sexp) (equal (car preceding-sexp) 'defvar))
preceding-sexp)))
(defun imalison:maybe-eval-defvar-as-setq ()
(interactive)
(let ((the-defvar (imalison:defvar-at-point)))
(when the-defvar
(eval `(setq ,@(cdr the-defvar))))))
#+END_SRC
Now we add advice to eval-last-sexp so that it has this behavior.
We noflet elisp--preceding-sexp to munge defvars into sexps only for
eval-last-sexp.
#+BEGIN_SRC emacs-lisp
(defun imalison:maybe-setq-instead (fn &rest args)
(or (imalison:maybe-eval-defvar-as-setq)
(apply fn args)))
(noflet ((elisp--preceding-sexp (&rest preceding-args)
(let* ((preceding-sexp (apply this-fn preceding-args)))
(if (and (listp preceding-sexp) (equal (car preceding-sexp) 'defvar))
`(setq ,@(cdr preceding-sexp))
preceding-sexp))))
(apply fn args)))
(advice-add 'eval-last-sexp :around 'imalison:maybe-setq-instead)
#+END_SRC